Effects of fine matters on strength and stiffness

Quy Ngoc Hoang, S. Y. Kim, J. U. Song, J. S. Lee

Research output: Contribution to conferencePaper

Abstract

Deposits of fine matters (silt and diatom microfossils) are a common feature in many sites around the world (including Ulleung Basin, Korea, Osaka Bay, Japan, and Mexico City, Mexico), and the existence of such deposits affects soil strength. The objective of this study is to investigate the effects of fine organic matters on the strengths and stiffnesses of soils using a triaxial apparatus incorporated with bender elements. The specimens used are artificial mixtures of sand and organic matters with different fine fraction in weight. Note that in terms of weight, the fines consist of 30% diatom and 70% silt. In addition, the shear waves were measured during shearing. The experiment results illustrated that the shear strengths of soil mixtures increased with increasing fines up to 20%, then decreased with increasing fines thereafter 20%. The elastic wave result shows that shear wave velocity decreases due to changes in the fabrics of soils caused by the increase of fines. The results of this study established a huge impact of fine particles on the strengths and stiffnesses of soils.

Original languageEnglish
Publication statusPublished - 2020
Event16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019 - Taipei, Taiwan, Province of China
Duration: 2019 Oct 142019 Oct 18

Conference

Conference16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019
CountryTaiwan, Province of China
CityTaipei
Period19/10/1419/10/18

Keywords

  • Diatom
  • Fines
  • Shear wave
  • Silt
  • Strength
  • Triaxial

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Hoang, Q. N., Kim, S. Y., Song, J. U., & Lee, J. S. (2020). Effects of fine matters on strength and stiffness. Paper presented at 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019, Taipei, Taiwan, Province of China.